Basic DbContext setup.

DiscordDelete/DiscordContext.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.EntityFrameworkCore;
+
+namespace DiscordDelete
+{
+    public class DiscordContext : DbContext
+    {
+        private const string DataPath = "messages.db";
+        public DbSet<GuildMessage> GuildMessages { get; set; }
+        public DbSet<PrivateMessage> PrivateMessages { get; set; }
+
+        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) =>
+            optionsBuilder.UseSqlite($"Data Source={DataPath}");
+    }
+
+    public class GuildMessage { }
+
+    public class PrivateMessage { }
+}